Boiler Control Instruction & Operation Manual
Page 4
3
of
68
Setup & Tuning
Parameter Adjustment
Slave
Sequencer
Factory
Setting
Range /
Choices
Parameter and Description
None
1 to 8
Boiler Address
Each boiler must be given a unique address. When
“Normal” slave selection order is used, the
boiler address is used by the Sequence Master as the boiler start order.
Normal
First
Normal
Last
Slave Selection Order
“Use Boiler First”;
Places the Slave in the lead permanently.
”Use Boiler Last”;
Places the slave last in the firing order.
Limits
Factory
Setting
Range /
Choices
Parameter and Description
20 (ºF)
(Stepped
Modulation
Recycle Offset
+ 6)
to 30
Stepped Modulation Start Offset
Stepped Modulation is provided to help the boiler continue to supply heat when
temperatures are beginning to approach Limits. This feature helps avoid manual reset
and soft lockouts by reducing the firing rate when the temperature i
s “Stepped
Modulation Start Offs
et” degrees below the Limit setting. For example, when the
setting is 20 F the maximum modulation rate will begin to be reduced when stack
temperature is 20 F below the Stack Limit and will be at minimum modulation when
stack temperature is 10 F below the limit.
Supply Temperature (High Limit 210 F)(see
Note
below),
Differential Temperature (Differential Temperature Limit 100 F),
Stack Temperature (Stack Limit 230 F),
Note
: This feature is not active for Supply temperature when it is the modulation
sensor. For example, this feature is active when Header Sensor is selected as
modulation sensor, when a boiler is a slave, when a boiler is responding to a remote
modulation demand (4-20mAdc or Modbus).
10 (ºF)
10 to
(Stepped
Modulation
Start Offset
–
6)
Stepped Modulation Recycle Offset
This feature helps avoid manual reset and soft lockouts by recycling the boiler when
the temperature i
s “Stepped Modulation Recycle Offset” degrees below the Limit
setting. For example, when the setting is 10 F the boiler will recycle.
Applicable to the following measurements.
Supply Temperature (High Limit 210 F)(see
Note
below),
Differential Temperature (Differential Temperature Limit 100 F),
Stack Temperature (Stack Limit 230 F),
Note
: This feature is not active for Supply temperature when it is the modulation
sensor. For example, this feature is active when Header Sensor is selected as
modulation sensor, when a boiler is a slave, when a boiler is responding to a remote
modulation demand (4-20mAdc or Modbus).
210 (ºF) 60 to 210 (ºF)
Preferred Supply High Limit
Adjustable high limit for the supply temperature. Only adjustable to a number below the
maximum High Limit in the control.
230 (ºF) 150 to 230 (ºF)
Preferred Stack High Limit
Adjustable high limit for the stack temperature. Only adjustable to a number below the
maximum Stack Limit in the control.
Press
to adjust the following parameters.
Press
to adjust the following parameters.
